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python-mysqlHow can I compare and contrast using Python with MySQL versus PostgreSQL?


Python can be used to compare and contrast data stored in MySQL and PostgreSQL databases. The two databases have many similarities, but there are also some major differences.

For example, MySQL is an open source database, while PostgreSQL is an object-relational database. MySQL is also more popular than PostgreSQL, but PostgreSQL offers more advanced features.

The following example code demonstrates how to compare and contrast data stored in MySQL and PostgreSQL databases using Python:

import mysql.connector
import psycopg2

# connect to MySQL
mydb = mysql.connector.connect(
    host="localhost",
    user="root",
    passwd="password"
)

# connect to PostgreSQL
pgdb = psycopg2.connect(
    host="localhost",
    user="postgres",
    password="password"
)

# compare data in MySQL and PostgreSQL
mycursor = mydb.cursor()
pgcursor = pgdb.cursor()

mycursor.execute("SELECT * FROM table")
pgcursor.execute("SELECT * FROM table")

myresult = mycursor.fetchall()
pgresult = pgcursor.fetchall()

for row in myresult:
    if row not in pgresult:
        print(row)

Code explanation

  1. import mysql.connector and import psycopg2 - imports the necessary modules for connecting to MySQL and PostgreSQL databases.
  2. mydb = mysql.connector.connect() and pgdb = psycopg2.connect() - establishes a connection to the MySQL and PostgreSQL databases.
  3. mycursor.execute() and pgcursor.execute() - executes a query to retrieve data from the MySQL and PostgreSQL databases.
  4. myresult = mycursor.fetchall() and pgresult = pgcursor.fetchall() - fetches the results of the query from the MySQL and PostgreSQL databases.
  5. for row in myresult: - iterates through the results of the query from the MySQL database.
  6. if row not in pgresult: - checks if the current row from the MySQL database is not present in the PostgreSQL database.
  7. print(row) - prints the current row from the MySQL database if it is not present in the PostgreSQL database.

Helpful links

  1. MySQL Documentation
  2. PostgreSQL Documentation

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